8549221536 has 72 divisors (see below), whose sum is σ = 24334308180. Its totient is φ = 2847108096.

The previous prime is 8549221529. The next prime is 8549221537. The reversal of 8549221536 is 6351229458.

8549221536 is a `hidden beast` number, since 8 + 5 + 4 + 92 + 21 + 536 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8455905936 + 93315600 = 91956^2 + 9660^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a junction number, because it is equal to n+sod(n) for n = 8549221491 and 8549221500.

It is not an unprimeable number, because it can be changed into a prime (8549221537) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 312006 + ... + 338298.

Almost surely, 2^8549221536 is an apocalyptic number.

It is an amenable number.

8549221536 is an abundant number, since it is smaller than the sum of its proper divisors (15785086644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8549221536 is a wasteful number, since it uses less digits than its factorization.

8549221536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27438 (or 27427 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The square root of 8549221536 is about 92462.0004975017. Note that the first 3 decimals coincide. The cubic root of 8549221536 is about 2044.7592916947.

The spelling of 8549221536 in words is "eight billion, five hundred forty-nine million, two hundred twenty-one thousand, five hundred thirty-six".